I did install but i didn't accept any add-ons... it didn't look right when opened the firefox2030, and something about fix your PC?!
So I found the real Mozilla site and downloaded and overwrote the other FireFox with Mozilla Firefox 36.0.1... everything *seems* okay now but is it?

My questions are: was the firefox2030.dmg just bogus (ads and stuff) or safe (old version) or really bad; and what do i need to do to my Mac, 10.10.2, to be safe going forward if I want to use FireFox from Mozilla? I have the Mozilla Firefox 36.0.1 installed and it "seems" to be okay, but is it?